Vulcan 219971OR Jobber Drill Bit, 5/16 in Dia, 4-1/2 in OAL, 3-Flat Shank

Titanium nitride coating reduces friction and last longer, cutting edge stays sharper longer. Split point eliminates the need for a center punch and keeps the drill from skating. All sizes 3/16 in and larger have three flats on the shank for a better grip on chuck. Super hard coating reduces friction and heat build up, resulting in extended tool life Surface drills cooler and lessens torque and downward drilling pressure All sizes 3/16 in and larger have 3 flats on the shank so that the chuck gets a better grip on t he bit All sizes 13/32 in and above have a 3/8 in reduced shank 135 deg split point eliminates the need for a center punch and keeps the drill from skating on hard materials